What are the main parameters for buying a digital camera?

Camera parameters? Generally divided into EV, shutter speed, aperture and ISO.

1, EV value: the amount reflecting the exposure. If the EV value increases or decreases, the shutter and aperture will be adjusted accordingly. The larger the EV value, the brighter the picture.

2. Shutter speed: represents the length of exposure time. Usually, in the case of sufficient light, the shorter the exposure time;

3. Aperture: a device used to control the amount of light entering the photosensitive surface of the fuselage through the lens. Under the same ISO and shutter conditions, the larger the aperture, the brighter the picture will be.

4.ISO: sensitivity. The higher the sensitivity value, the more light is received. Under the same aperture and shutter conditions, the picture will be brighter with the increase of sensitivity. The noise (graininess) of the opposite picture will also increase.

Personally, I think the main choice for choosing a digital camera is "effective pixel". Pixels largely determine the image quality. Of course, in addition to pixels, lenses, photosensitive elements, image processors and camera programs are all factors that determine image quality. The optical zoom coefficient of telephoto digital camera increases, and the larger the optical zoom remarks, the farther the scene is photographed.

I made a strategy before and compared several cameras.

1, Fuji XF 10? ; The price is less than 3000; The effective pixel is 24 million, the equivalent focal length is 28mm f2.8- 16, and the video is 4k; Suitable for ordinary travel and recording life; Built-in filter, good picture quality; But it is not easy to focus when the light is bad;

XF 10 is small and weighs only 280 grams. With APS-C format and brand-new functions, it has become an ideal companion for smartphone users to upgrade their shooting and photographers. XF 10 is equipped with APS-C size sensor, which not only has excellent photo quality, but also has ultra-wide dynamic range. The imaging sharpness is clear and the resolution is high, which can completely meet the shooting needs of various photographers. Use 18.5mmF2.8 Fuji Dragon lens (equivalent to 35mm frame with 28mm focal length), which is suitable for shooting various subjects from scenery to street shooting. It combines all the functions of X-series cameras, easy-to-use control, high-definition image quality and various creative shooting options to bring a lot of excitement. XF 10 has many new shooting functions. It adopts a brand-new way to automatically transfer images to smartphones. The function of "street shooting" is also added. The preset focal length and aperture can be 2M/F8 or 5M/F5.6

2. Sony DSC-RX100M7; The price is expensive, around 8000; The effective pixel is 2065438+ ten thousand, the equivalent focal length is 24-200mm f2.8-4.5, and the video is 4K. This evaluation is very general and suitable for people who need telephoto and various shooting needs.

The new generation of RX 100 series flagship black card DSC-RX 100M7 is equipped with a large zoom lens of 24-200mm in a compact body, providing multi-scene shooting capability; The newly developed 1 inch Exmor RS stacked image sensor has an effective pixel of about 2,065,438+million. While maintaining high image quality, it has a high-speed continuous shooting without black screen of 20 frames per second, which makes it easier to shoot sports subjects. If Vlog shooting is needed, the camera adds 3.5mm microphone input, video vertical shooting support and 4K video anti-shake enhancement mode. The real-time eye focusing function is added, which makes the video focusing more accurate, the picture more stable and the recording clearer.

3. Ricoh GRIII-45；; The price is about 6000 yuan, the effective pixel is 24 million, the equivalent focal length is 28mm f2.8, the video is full HD 1080P, and it has its own filter, which makes the portrait look good. Recommended!

GR3 adopts APS-C frame, about 24 million pixels, no low-pass CMOS, and supports mixed detection of AF phase/contrast. Compared with GR/GR2, the image quality and focusing performance should be significantly improved. Like Pentax's new digital SLR, it integrates an image processor "acceleration component" (similar to Sony's front-end LSI), which can improve the processing performance and noise reduction effect and help GR3 reach the highest sensitivity of ISO 102400. The CMOS unit also integrates ultrasonic dust removal function to prevent dust from affecting the shooting effect.

The specification is still 18.3/2.8 (Quan Huafu equivalent specification is 28/4), but the lens on GR3 is newly developed. The intuitive result is that the recent focusing distance has been shortened from 0. 1m to 0.06m (the magnification is about 0.35x), and the optical size has become more compact. Even so, the built-in ND4 filter is still preserved, which is commendable. Many people complain that the telescopic lens will delay shooting time. This time GR3 used a more powerful lens motor, and the official claimed that the time from closing to shooting was only 0.8 seconds.

The redesign of the lens is largely due to the adoption of CMOS displacement anti-shake elements in GR3. Anti-shake components occupy more space in the machine, and only a smaller lens unit can ensure that the size of the machine body is still portable. In fact, combined with the elimination of the built-in flash and other adjustments, GR3 has a smaller body size than GR/GR2. GR3 can provide 3-axis jitter compensation for horizontal/vertical swing and rotation * * *, and the maximum anti-shake effect is around 4th gear. At the same time, GR3 supports analog low-pass filter function (like most Pentax digital SLR).

Image style: In addition to the compact body, equivalent focal length of 28mm and quick snapshot mode, Ricoh GR series is most talked about by its image style. GR3 combines the previous "image setting" with "portrait effect" and provides a new "portrait adjustment function", which can adjust the color, hue, hue, contrast, contrast (light/dark), sharpness, brightness, hue, filter effect, granularity and HDR hue.

The above is for your reference.